SONY SPP68
Instrukcja Serwisowa

RX Section Adjustment
1. RX Level Adjustment � Perform the adjustment at T1CH (26CH: 43.780 MHz) as a rule. Setting :
FM RF SSG HAND MAIN board TP2 TP3 (RX GND)

3. RSSI (H) Sensitivity Adjustment � Perform the adjustment at T1CH (26CH: 43.780 MHz) as a rule. Setting :
AF ocillator FM RF SSG HAND MAIN board TP2 TP3 (RX GND) output: 20 Hz

Procedure : 1. FM RF SSG condition : Carrier frequency : 43.780 MHz Modulation : 1 kHz Deviation : 3 kHz Output level : 60 dBµV (1 mV) (EMF) 2. Adjust the FL101 for the maximum reading on the level meter. Also check that the output level is within the specified values.
level meter HAND MAIN board + � TP27 (SP) TP26 (SP)

Procedure : 1. FM RF SSG condition : Carrier frequency : 43.780 MHz Modulation frequency : 20 Hz (EXT) Deviation : AM 50% Output level : 2 dBµV (1.259 µV) (EMF) 2. Use the oscilloscope to confirm the FM RF SSG input (AF) signal waveform and RSSI signal, and use the RV101 so that they are synchronized matched (duty is synchronized).
oscilloscope (DC range) HAND MAIN board + � TP9 (SIG IN) TP3 (RX GND)
RSSI WAVEFORM

Specified value: �16.6 to �8.6 dBV Adjustment Location: HAND MAIN board (See page 17)

RSSI output waveform

2. RX VT Adjustment Setting:
digital voltmeter

0V RF signal EXT signal 20Hz Adjust so that they synchronize at 0V.

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TP5 (RX VT) TP3 (RX GND)

Adjustment Location: HAND MAIN board (See page 17)

Procedure: 1. The digital voltmeter connected TP5 (RX VT) to TP3 (RX GND). 2. Adjust the L102 for 0.8 V ± 0.05 V reading on the digital voltmeter. Adjustment Location: HAND MAIN board (See page 17)

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